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Open Source Voip Software , Top IP Telephony application of 2019

Open source software has leading role in emerging of present Information and communication technologies (ICT), Following is list of top rated , mature and reliable open source applications that revolutionized the communication concepts. We have tried our best to include best applications in each category however if you have any news please share with us to keep this post updated .

Open source communications softswitches / IP Telephony applications

FreeSWITCH

A Cross-platform, Scalable, Stable Multi-Protocol Soft Switch ,The project inspired from renown Open Source asterisk PBX system but very well designed and has a bright futurehttp://www.freeswitch.org

Asterisk

A software-based, Open Source Converged PBX system that has revolutionized the traditional PBX industryhttp://www.asterisk.org

FreePBX

RasPBX

RasPBX is a project dedicated to Asterisk and FreePBX running on the Raspberry Pi. For any information related to Raspberry Pi, check the original website at raspberrypi.org.http://www.raspberry-asterisk.org

Call Center Solutions

GoAutodial

Goautodial (vicidial) is a professional web based inbound / outbound call center solution built over asteriskhttp://goautodial.org/

OSDial

OSDial is a pull-featured predictive dialer solution built over asteriskhttp://osdial.com/

Communications Frameworks

ICTCore

ICTCore core is open source unified communications framework for developers and integrators to rapidly develop ICT based applications using their existing development skills. By using ICTCore, developer can create communication based applications such as Auto attendant, Fax to Email, Click to Call etc.. they can program custom business logic that can control incoming and outgoing communication instances.

SIP protocol stack / SIP development Libraries

PJSIP

Pjsip is sip based open source high performance communication library with multimedia capabilities written in C language for building embedded/non-embedded VoIP applications.http://www.pjsip.org/

JsSIP

JsSIP is a simple to use JavaScript library which leverages latest developments in SIP and WebRTC to provide a fully featured SIP endpoint in any website.

With JsSIP any website can get Real Time Communications features using audio, video and more with just a few lines of code.
Features

SIP over WebSocket transport.
Audio/video calls, instant messaging and presence.
Lightweight!.
100% pure JavaScript built from the ground up.
Easy to use and powerful user API.
Works with OverSIP, Kamailio and Asterisk servers.

SIP.js

SIP.js is a simple, intuitive, and powerful JavaScript signaling library . It is full-featured SIP stack written in JavaScript. With SIP.js, you can harness the power of WebRTC to build audio, video, and realtime data into your application. SIP.js is fast, lightweight, and easy to use.

Broadcasting Platform

ICTDialer

CTDIALER is an open source, unified communications auto dialer software . ICTDialer is multi-tenant with Voice, SMS and Fax broadcasting capabilities developed over re-known open source Content Management System Drupal and Freeswitch based powerful ICTCore Communication Framework.http://ictdialer.org/

Billing Systems

Pyfreebilling

pyfreebilling is an open source wholesale billing platform for FreeSWITCH designed for high performance and scalability. It is suitable for residential, business and wholesale VoIP providers https://www.pyfreebilling.com//

A2billing

A2Billing combined with Asterisk is a physical Telecom Platform and Soft-Switch providing a wide range of telecoms services using both traditional telephone technology or VoIP. It contains a real time billing enginehttp://www.asterisk2billing.org

Freeside

Freeside is the premier open-source billing, CRM, trouble ticketing and provisioning automation software for wired and wireless ISPs, VoIP, hosting, service and content providers and other online businesses.http://freeside.biz/freeside/

Fax over IP application Clients

ICTFAX

Voip softphones / Clients

sipml5

This is the world's first open source HTML5 SIP client entirely written in javascript for integration in social networks (FaceBook, Twitter, Google+), online games, e-commerce websites, email signatures... No extension, plugin or gateway is needed. The media stack rely on WebRTC.
The client can be used to connect to any SIP or IMS network from your preferred browser to make and receive audio/video calls and instant messages.https://www.doubango.org/sipml5/

Twinkle

Twinkle is sip based softphone and support both voice over IP and and instant messaging communications , It is sip standard compliant with advance features including secure voice communications using ZRTP / SRTP.http://www.twinklephone.com/

Jisti

Jitsi is a set of open-source projects that allows you to easily build and deploy secure videoconferencing solutions. At the heart of Jitsi are Jitsi Videobridge and Jitsi Meet, which let you have conferences on the internet, while other projects in the community enable other features such as audio, dial-in, recording, and simulcasting.
It supports HD sound quality and video up to DVD size and quality. https://jitsi.org/

Ekiga

Ekiga is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet.
It supports HD sound quality and video up to DVD size and quality. http://ekiga.org/